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Ray Model

Ray Model. A useful model under certain circumstances to explain image formation. Ray Model: Light travels in straight-line paths, called rays, in ALL directions from the source. Concave Mirror. Focal point.

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Ray Model

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  1. Ray Model A useful model under certain circumstances to explain image formation. Ray Model: Light travels in straight-line paths, called rays, in ALL directions from the source.

  2. Concave Mirror

  3. Focal point Rays parallel to the axis of the mirror pass through the focal point of the mirror.

  4. Object distance > f

  5. Object distance < f

  6. Sketching ray diagrams Select a single source point. Sketch a ray parallel to the axis of the mirror that reflects through the focal point. Sketch a ray that reflects off the center of the mirror at the mirror’s axis at an angle equal to the angle of incidence. Sketch a ray that is incident normal to the mirror and reflects back through itself. Sketch a ray that passes through the focal point and reflects parallel to the axis of the mirror. At the intersection of these rays is the image point.

  7. Relate object distance, image distance, and focal length sign convention for mirrors

  8. Example An object is 10 cm from a concave mirror of focal length 20 cm. (a) What is the image distance? (b) What is the magnification? (c) Is the image real or virtual? (d) Is it inverted or upright?

  9. 1 2 . 3 V C Aketchup bottle is positioned in front of a concave mirror. Three of the incident rays are shown. a. _________ get(s) reflected through point C. A. Ray 1 B. Ray 2 C. Ray 3 D. All three rays E. None of the rays

  10. 1 2 . 3 V C Aketchup bottle is positioned in front of a concave mirror. Three of the incident rays are shown. b. _________ get(s) reflected horizontally to the left. A. Ray 1 B. Ray 2 C. Ray 3 D. All three rays E. None of the rays

  11. 1 2 . 3 V C Aketchup bottle is positioned in front of a concave mirror. Three of the incident rays are shown. c. _________ make(s) the same angle with the normal as its reflected ray does. A. Ray 1 B. Ray 2 C. Ray 3 D. All three rays E. None of the rays

  12. 1 2 . 3 V C Aketchup bottle is positioned in front of a concave mirror. Three of the incident rays are shown. d. _________ make(s) the same angle with the horizontal as its reflected ray does. A. Only ray 1 B. Only ray 2 C. Only ray 3 D. More than one of the rays E. None of the rays

  13. front view edge of card view of card ? Suppose the top half of the mirror is blocked by an opaque card. With the card in place, we see__________. A. no image B. an image of the entire object C. an image of just the top half of the object D. an image of just the bottom half of the object object . V C image A concave mirror forms an image of an object as shown. Show in Slide Show view to have question appear in stages.

  14. R 4 3 1 2 V      C R/2 The concave mirror has a radius of curvature R. At which of the numbered points could you place an object perpendicular to the central axis (like this: ) and see a. a reduced real image? A. 1 B. 2 C. 3 D. 4 E. none of these

  15. R 4 3 1 2 V      C R/2 The concave mirror has a radius of curvature R. At which of the numbered points could you place an object perpendicular to the central axis (like this: ) and see b. an enlarged virtual image? A. 1 B. 2 C. 3 D. 4 E. none of these

  16. R 4 3 1 2 V      C R/2 The concave mirror has a radius of curvature R. At which of the numbered points could you place an object perpendicular to the central axis (like this: ) and see c. a reduced virtual image? A. 1 B. 2 C. 3 D. 4 E. none of these

  17. R 4 3 1 2 V      C R/2 The concave mirror has a radius of curvature R. At which of the numbered points could you place an object perpendicular to the central axis (like this: ) and see d. an enlarged real image? A. 1 B. 2 C. 3 D. 4 E. none of these

  18. R 4 3 1 2 V      C R/2 The concave mirror has a radius of curvature R. At which of the numbered points could you place an object perpendicular to the central axis (like this: ) and see e. no image? A. 1 B. 2 C. 3 D. 4 E. none of these

  19. Convex Mirror so>f; image is virtual and upright

  20. Convex Mirror so< f ; image is virtual and upright

  21. Poll Is the side mirror on a car a concave or convex mirror? concave convex neither, because it is a plane mirror

  22. Activity Use the Optics Workbench to create simulations of the of the following situations. Compare your own calculation to the result from the simulation. Concave mirror; f = 1 m; so = 3 m; h=0.5 m;What is the image distance and image height? Concave mirror; f = 1 m; so = 0.5 m; h=0.5 m;What is the image distance and image height? Convex mirror: f = -1 m; so=0.5 m; h=0.5 m;What is the image distance and image height?

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